Which heart chamber is associated with the pulmonary arteries?

The right ventricle is associated with the pulmonary arteries because it is responsible for pumping deoxygenated blood into the pulmonary circulation. When the heart beats, the right ventricle contracts, sending blood through the pulmonary valve into the pulmonary trunk, which then divides into the left and right pulmonary arteries. These arteries carry the blood to the lungs, where it receives oxygen and releases carbon dioxide.

In contrast, the left atrium receives oxygenated blood from the lungs via the pulmonary veins, the right atrium receives deoxygenated blood from the body through the superior and inferior vena cavae, and the left ventricle pumps oxygenated blood to the rest of the body through the aorta. Thus, the role of the right ventricle as the chamber that directly leads to the pulmonary arteries solidifies its association with pulmonary circulation.